A two-step concept is proposed in order to derive a consistent set of intervention levels for early (sheltering, evacuation) and late (relocation/resettlement, returning) protective actions that have to be considered in radiation emergency planning. In the first step, the dose ratios of the projected effective doses have to be calculated for four defined time periods, which correspond with the integration times for sheltering and relocation. In the second step, it is necessary to adopt an intervention level for one protective action or a more general reference level for a certain time period as, for example, the reference level recommended by the International Commission on Radiological Protection (ICRP) Publication 103 in 2007. The adopted intervention level or reference level and the relationships between the projected effective doses are used to derive a consistent set of intervention levels for early and late protective actions. To illustrate the two-step concept, four sets of intervention levels are exemplarily derived for two accidental releases from nuclear power plants.
* Bundesamt für Strahlenschutz (BfS), D-79098 Freiburg, Germany; † National Commission for Nuclear Activities Control, Libertatii 14 Blvd., Bucharest 5, Romania; ‡ Bundesamt für Strahlenschutz (BfS) D-Oberschleissheim, Germany; § Federal Office of Civil Protection, National Emergency Operations Centre (NEOC) Zuerich, Switzerland; ** Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH, 50667 Köln, Germany; ††Consejo de Seguridad Nuclear (CSN), E-28040 Madrid, Spain; ‡‡ Bundesministerium für Land und Forstwirtschaft, Umwelt und Wasserwirtschaft (BMLFUW) A-1030 Wien, Austria; §§ Norwegian Radiation Protection Authority, N-1332 Østerås, Norway; *** Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU), 53175 Bonn, Germany; ††† National Public Health and Medical Officer Service (NPHMOS), 1437 Budapest, Hungary; ‡‡‡ Nuclear Regulatory Authority, 69 Shipchensky Prohod Blvd, 1574 Sofia, Bulgaria; §§§ National Research Institute for Radiobiology and Radiohygiene (NRIRR), 1775 Budapest, Hungary; **** Federal Agency for Nuclear Control (FANC), 1000 Brussels, Belgium.
For correspondence contact: E. Wirth, Bundesamt für Strahlenschutz (BfS), D-79098 Freiburg, Germany, or email at firstname.lastname@example.org.
(Manuscript accepted 26 July 2010)